1Option De-duplication
2^^^^^^^^^^^^^^^^^^^^^
3
4The final set of options used for a target is constructed by
5accumulating options from the current target and the usage requirements of
6its dependencies.  The set of options is de-duplicated to avoid repetition.
7
8.. versionadded:: 3.12
9  While beneficial for individual options, the de-duplication step can break
10  up option groups.  For example, ``-option A -option B`` becomes
11  ``-option A B``.  One may specify a group of options using shell-like
12  quoting along with a ``SHELL:`` prefix.  The ``SHELL:`` prefix is dropped,
13  and the rest of the option string is parsed using the
14  :command:`separate_arguments` ``UNIX_COMMAND`` mode. For example,
15  ``"SHELL:-option A" "SHELL:-option B"`` becomes ``-option A -option B``.
16